Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad0e60da3ff5f44…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 17:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c7c9a70dc9ca2a6f2edb39ed2b12bf4 SHA-1: c2677b1eac1bd1bb7f329ad223a95ffebd330705 SHA-256: 3ad0e60da3ff5f44f44df489c1d0969b5b26e1f647edb3075d94aa41c57c00ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=ms+crm+tutorial+pdf PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b969c62c3---buninaxo.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/92955084195.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/72023525778.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/24955844576.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/974c9a6c294fc825cb40ab88fd5da5af/57634932924.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/rusabefanutawekomeluk.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b3e3c89fd72e8b96b11d5cdc072a96bc/jaluxavubizivokigugu.pdfIn PDF document text
    • http://vodnik48.ru/content/file/78587074306.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/16335513243.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/wabowejelexawafimubexapi.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/37420343434.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/36019562921.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/76174434325.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/62974940243.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3d39f1b66---24358484838.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021070311211861.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/kanomepogumemuko.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085caf491b08---6987101037.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ee9a5834---bofasax.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607795150ec92---guxivepoguteloramoluvigev.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/30385847393.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/barojagekewa.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a63092467---modavikiziwulemuf.pdfIn PDF document text
    • https://lapdonline.org/file/64855687819.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 17548 bytes
SHA-256: 8fd070621d2fbebe2b65d46acab3727a585a50828dbb4036af11c8c57ba5792e
font_01_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3C 10640 bytes
SHA-256: b7c52578b6e953b7fd4816843a917698d9d57478130d80bceed78643bbc239ff

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